//
// Created by Administrator on 11/26/2017.
//

#include <stdio.h>
void inplace_swap(int *x, int *y) {
    *y = *x ^ *y;
    *x = *x ^ *y;
    *y = *x ^ *y;
}

void reverse_array(int a[], int cnt) {
    int first, last;
    for(first = 0, last = cnt - 1; first < last; first++, last--) {
        inplace_swap(&a[first], &a[last]);
    }
}


int main() {
    printf("%.2x", ~0);
}